/usr/include/camp/detail/issmartpointer.hpp is in libcamp0.7-dev 0.7.1.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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**
** Copyright (C) 2009-2010 TECHNOGERMA Systems France and/or its subsidiary(-ies).
** Contact: Technogerma Systems France Information (contact@technogerma.fr)
**
** This file is part of the CAMP library.
**
** CAMP is free software: you can redistribute it and/or modify
** it under the terms of the GNU Lesser General Public License as published by
** the Free Software Foundation, either version 3 of the License, or
** (at your option) any later version.
**
** CAMP is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
** GNU Lesser General Public License for more details.
**
** You should have received a copy of the GNU Lesser General Public License
** along with CAMP. If not, see <http://www.gnu.org/licenses/>.
**
****************************************************************************/
#ifndef CAMP_DETAIL_ISSMARTPOINTER_HPP
#define CAMP_DETAIL_ISSMARTPOINTER_HPP
#include <camp/detail/yesnotype.hpp>
#include <boost/utility/enable_if.hpp>
namespace camp
{
namespace detail
{
/**
* \brief Utility class which tells at compile-time if a type T is a smart pointer to a type U
*
* To detect a smart pointer type, we check using SFINAE if T implements an operator -> returning a U*
*/
template <typename T, typename U>
struct IsSmartPointer
{
// Check non-const signature
template <typename V, U* (V::*)()> struct TestForMember {};
template <typename V> static TypeYes check(TestForMember<V, &V::operator-> >*);
template <typename V> static TypeNo check(...);
// Check const signature
template <typename V, U* (V::*)() const> struct TestForConstMember {};
template <typename V> static TypeYes checkConst(TestForConstMember<V, &V::operator-> >*);
template <typename V> static TypeNo checkConst(...);
enum {value = (sizeof(check<T>(0)) == sizeof(TypeYes))
|| (sizeof(checkConst<T>(0)) == sizeof(TypeYes))};
};
} // namespace detail
} // namespace camp
namespace boost
{
/**
* \brief Specialization of boost::get_pointer for all smart pointer types (const version)
*
* This function is specialized for every type T for which IsSmartPointer<T> is true. It makes
* the stored value available for all boost algorithms (especially for boost::bind).
*/
template <template <typename> class T, typename U>
U* get_pointer(const T<U>& obj, typename enable_if<camp::detail::IsSmartPointer<T<U>, U> >::type* = 0)
{
return obj.get();
}
/**
* \brief Specialization of boost::get_pointer for all smart pointer types (non-const version)
*
* This function is specialized for every type T for which IsSmartPointer<T> is true. It makes
* the stored value available for all boost algorithms (especially for boost::bind).
*/
template <template <typename> class T, typename U>
U* get_pointer(T<U>& obj, typename enable_if<camp::detail::IsSmartPointer<T<U>, U> >::type* = 0)
{
return obj.get();
}
} // namespace boost
#endif // CAMP_DETAIL_ISSMARTPOINTER_HPP
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